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BudgeterDataContext.cs

Language: C#
Last Modified: 2020-06-27 1:58:31 PM UTC
File Size: 5940 bytes
http://www.penguinstew.ca/example/dataviewer/Model/Connection/BudgeterDataContext.cs
using System.Data.Linq;
using System.Linq;
using System;
using System.Reflection;
using System.Data.Linq.Mapping;
namespace Budgeter.Model.Connection
{
/// <summary>
/// Data context class for the budgeter project
/// </summary>
public class BudgeterDataContext : DataContext
{
#region Variables
/// <summary>
/// Table containing transaction information
/// </summary>
public Table<Transaction> Transactions = null;
/// <summary>
/// Table containing transaction category information
/// </summary>
public Table<Category> Categories = null;
/// <summary>
/// Table containing global budget type information
/// </summary>
public Table<BudgetType> BudgetTypes = null;
/// <summary>
/// Table mapping budget types to categories
/// </summary>
public Table<BudgetCategory> BudgetCategories = null;
/// <summary>
/// Table containing monthly instances of budget types
/// </summary>
public Table<BudgetMonth> BudgetMonths = null;
/// <summary>
/// Table containing month information
/// </summary>
public Table<Month> Months = null;
/// <summary>
/// Table containing global special account information
/// </summary>
public Table<SpecialAccount> SpecialAccounts = null;
/// <summary>
/// Table containing monthly instances of special accounts
/// </summary>
public Table<SpecialAccountMonth> SpecialAccountMonths = null;
/// <summary>
/// Table containing global recurring Payment information
/// </summary>
public Table<RecurringPayment> RecurringPayments = null;
/// <summary>
/// Table containing information about specific items belong to recurring Payments
/// </summary>
public Table<RecurringPaymentItem> RecurringPaymentItems = null;
/// <summary>
/// Table containing monthly instances of recurring Payments
/// </summary>
public Table<RecurringPaymentMonth> RecurringPaymentMonths = null;
/// <summary>
/// Private instance variable
/// </summary>
private static BudgeterDataContext g_instance;
#endregion
#region Constructor
/// <summary>
/// Creates a new data context using the default connection string from the manager
/// </summary>
public BudgeterDataContext()
:this(new ConnectionStringManager().GetConnectionString())
{
}
/// <summary>
/// Creates a new data context based on the given connection string
/// </summary>
/// <param name="connectionString">The connection string to use</param>
private BudgeterDataContext(string connectionString)
: base(connectionString)
{
}
#endregion
#region Properties
public static BudgeterDataContext Instance
{
get
{
if (g_instance == null)
{
g_instance = new BudgeterDataContext();
}
return g_instance;
}
}
#endregion
#region Public Methods
/// <summary>
/// Creates a new data context with the given connection manager Reinitialize
/// </summary>
/// <param name="connectionManager">The connection manager used to get the new connection string</param>
public static void Reinitialize(ConnectionStringManager connectionManager)
{
g_instance = new BudgeterDataContext(connectionManager.GetConnectionString());
}
/// <summary>
/// Deletes the database this data context refers to and then recreates it.
/// </summary>
public void ReCreateDatabase()
{
this.DeleteDatabase();
this.CreateDatabase();
}
/// <summary>
/// Tests the database connection to make sure it has all the correct tables
/// </summary>
public void TestServer()
{
//Create database if it doesn't already exist
if (!this.DatabaseExists())
{
this.CreateDatabase();
}
//Test tables
var specialAccounts = this.SpecialAccounts.FirstOrDefault();
var SpecialAccountMonths = this.SpecialAccountMonths.FirstOrDefault();
var BudgetCategories = this.BudgetCategories.FirstOrDefault();
var BudgetMonths = this.BudgetMonths.FirstOrDefault();
var BudgetTypes = this.BudgetTypes.FirstOrDefault();
var Categories = this.Categories.FirstOrDefault();
var Months = this.Months.FirstOrDefault();
var Transactions = this.Transactions.FirstOrDefault();
var RecurringPayments = this.RecurringPayments.FirstOrDefault();
var RecurringPaymentMonths = this.RecurringPaymentMonths.FirstOrDefault();
var RecurringPaymentItems = this.RecurringPaymentItems.FirstOrDefault();
}
#endregion
/// <summary>
/// Refreshes each item to overwrite current values
/// </summary>
/// <param name="entities">The entities to refresh</param>
public void Refresh(params IRefreshableTable[] entities)
{
foreach(IRefreshableTable entity in entities.Where(o => o != null))
{
this.Refresh(RefreshMode.OverwriteCurrentValues, entity);
entity.RefreshEntitySets(this);
}
}
}
}
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